St. Tammany Parish Fire District No. 12 firefighters are investigating an overnight fire that significantly damaged a vacant house south of Covington. The fire broke out at 1:15 a.m., according to Fire District No. 12.

Firefighters arrived within seven minutes and had the fire under control by 1:48 a.m. Four engines, one rescue unit, four support vehicles and 18 firefighters responded.

The house, at 70378 A Street in the Tammany Hills subdivision, has been vacant for more than a year, authorities said.